664777072 has 20 divisors (see below), whose sum is σ = 1309838040. Its totient is φ = 326754368.

The previous prime is 664777037. The next prime is 664777097. The reversal of 664777072 is 270777466.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351163 + ... + 353050.

It is an arithmetic number, because the mean of its divisors is an integer number (65491902).

Almost surely, 2^664777072 is an apocalyptic number.

It is an amenable number.

664777072 is a deficient number, since it is larger than the sum of its proper divisors (645060968).

664777072 is a wasteful number, since it uses less digits than its factorization.

664777072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704280 (or 704274 counting only the distinct ones).

The product of its (nonzero) digits is 691488, while the sum is 46.

The square root of 664777072 is about 25783.2711656221. The cubic root of 664777072 is about 872.7543272179.

The spelling of 664777072 in words is "six hundred sixty-four million, seven hundred seventy-seven thousand, seventy-two".